Experimental and numerical evaluation of spontaneous imbibition processes in unfractured and fractured carbonate cores with stress-induced apertures

Odilla Vilhena, Amir Farzaneh, Jackson Pola, Rafael March, Adam Sisson, Mehran Sohrabi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Spontaneous imbibition (SI) experiments in fractured and unfractured Indiana limestone cores were performed to evaluate the impact of fractures in oil recovery. Numerical simulations were run to reproduce the experimental setting and history match fracture and matrix properties. Tracer tests were carried out to investigate the effect of changing stresses in the hydraulic fracture conductivity. The pore space and connected pores in the fractured plug were analysed via Micro-CT scan and thin petrography analysis was carried out to observe the matrix heterogeneity of the samples. Relative permeability, capillary pressure and fracture properties were estimated numerically for Indiana limestone carbonate rocks to match the SI curves measured at a temperature of 58.7° C. The investigation shows that the fractured core has suffered a deformation under stress conditions impacting the initial values of fracture aperture and permeability. This deformation has led to decreased flow rates in the fracture and oil trapping in the fracture channel. At the field scale, this phenomenon could lead to decreased oil recovery in the first days of production.

Original languageEnglish
Title of host publicationSPE Europec Featured at 81st EAGE Conference and Exhibition 2019
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613996614
DOIs
Publication statusPublished - 3 Jun 2019
EventSPE Europec Featured at 81st EAGE Conference and Exhibition 2019 - London, United Kingdom
Duration: 3 Jun 20196 Jun 2019

Conference

ConferenceSPE Europec Featured at 81st EAGE Conference and Exhibition 2019
CountryUnited Kingdom
CityLondon
Period3/06/196/06/19

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology

Fingerprint Dive into the research topics of 'Experimental and numerical evaluation of spontaneous imbibition processes in unfractured and fractured carbonate cores with stress-induced apertures'. Together they form a unique fingerprint.

  • Cite this

    Vilhena, O., Farzaneh, A., Pola, J., March, R., Sisson, A., & Sohrabi, M. (2019). Experimental and numerical evaluation of spontaneous imbibition processes in unfractured and fractured carbonate cores with stress-induced apertures. In SPE Europec Featured at 81st EAGE Conference and Exhibition 2019 [SPE-195452-MS] Society of Petroleum Engineers. https://doi.org/10.2118/195452-MS